820/1070 (Sahih) From Sahl ibn Sa'd: That a man looked through a hole in the door of the Prophet, peace be upon him, and with the Prophet, peace be upon him, was a comb with which he was scratching his head. When the Prophet, peace be upon him, saw him, he said: "If I had known you were looking, I would have poked your eye with it." And the Prophet, peace be upon him, said: "Permission has only been prescribed because of the sight."